Zircon U-Pb and Hf isotopic constraints from eastern Transhimalayan batholiths on the precollisional magmatic and tectonic evolution in southern Tibet

doi:10.1016/j.tecto.2009.02.034

	Zircon U-Pb and Hf isotopic constraints from eastern Transhimalayan batholiths on the precollisional magmatic and tectonic evolution in southern Tibet
	Chiu, Han-Yi 1; Chung, Sun-Lin 1; Wu, Fu-Yuan 2; Liu, Dunyi 3; Liang, Yu-Hsuan 1; Lin, I-Jhen 1; Iizuka, Yoshiyuki 4; Xie, Lie-Wen 2; Wang, Yanbin 3; Chu, Mei-Fei 1
刊名	TECTONOPHYSICS
	2009-11-01
卷号	477 期号:1-2 页码:3-19
关键词	Zircon U-Pb and Hf isotope Tethyan subduction Transhimalayan batholiths Tibet Tectonic evolution
ISSN号	0040-1951
DOI	10.1016/j.tecto.2009.02.034
文献子类	Article
英文摘要	Before the Indian collision with Asia, northward subduction of the Neo-Tethyan oceanic lithosphere produced an Andean-type convergent margin in South Asia characterized by arc magmatism starting from the early Jurassic and lasting until the Eocene. The magmatic arc is now represented by widespread intrusive bodies or the so-called Transhimalayan batholiths in the Lhasa terrane of southern Tibet that have been divided into two main magmatic suites, i.e., the northern plutonic belt and the southern Gangdese Batholith. Their temporal distribution, concerning how exactly the magmatic suites correlate eastwards and then southeastwards around the eastern Himalayan syntaxis, however, remains poorly constrained. Here we report the first combined zircon U-Pb and Hf isotopic study of the Transhimalayan batholiths from the eastern part of the Lhasa terrane (similar to 95-97.5 degrees E and similar to 28.5-30 degrees N), SE Tibet. Zircon U-Pb dating results of 24 granitoids indicate that the rocks were emplaced principally in the Early Cretaceous (similar to 133-110 Ma) and subordinately in the Paleocene (similar to 66-57 Ma), long after an older granite intrusion in the earliest Jurassic (similar to 198 Ma). The zircon epsilon(Hf)(T) values range from +5 to -20, yielding Hf crustal model ages (T-DM(C)) between 0.8 and 2.4 Ga that peak at similar to 1.7 Ga, suggesting a major episode of crustal growth in the Proterozoic and a predominantly, or even exclusively, crustal source for the granitoid petrogenesis. These zircon U-Pb and Hf isotopic constraints, together with whole-rock geochemical characteristics, allow us to correlate them to S-type granitoids in the northern plutonic belt, rather than to the I-type Gangdese Batholith from the central part of the southern Lhasa terrane. In contrast to the Gangdese magmatism that formed with a significant juvenile mantle input related to the Neo-Tethyan subduction, these S-type granitoids show geochemical similarities to the North American Cordilleran Interior batholiths that did not form directly from a subduction setting. Thus, we attribute the petrogenesis of the widespread Early Cretaceous granitoids in the northern belt and eastern Himalayan batholiths to a postcollisional regime due to the Late Jurassic-Early Cretaceous continental collision between the Lhasa and Qiangtang terranes. Under this framework, the S-type magmatism was generated in response to collision-induced crustal thickening, which may have capabilities of causing crustal anatexis by itself in the region. However, continued interplay with the Neo-Tethyan subduction zone processes such as back-arc extension could also have played a crucial, and long-lasting, role in the magma generation. (C) 2009 Elsevier B.V. All rights reserved.
WOS关键词	VOLCANIC-ROCKS ; CONTINENTAL COLLISION ; SOUTHEASTERN TIBET ; MASS-SPECTROMETRY ; PETROGENESIS ; LHASA ; GEOCHRONOLOGY ; GEOTRAVERSE ; GANGDESE ; HIMALAYA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000271776600002
资助机构	National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC ; National Science Council, Taiwan, ROC
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/71880]
专题	中国科学院地质与地球物理研究所
通讯作者	Chung, Sun-Lin
作者单位	1.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 4.Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan
推荐引用方式 GB/T 7714	Chiu, Han-Yi,Chung, Sun-Lin,Wu, Fu-Yuan,et al. Zircon U-Pb and Hf isotopic constraints from eastern Transhimalayan batholiths on the precollisional magmatic and tectonic evolution in southern Tibet[J]. TECTONOPHYSICS,2009,477(1-2):3-19.
APA	Chiu, Han-Yi.,Chung, Sun-Lin.,Wu, Fu-Yuan.,Liu, Dunyi.,Liang, Yu-Hsuan.,...&Chu, Mei-Fei.(2009).Zircon U-Pb and Hf isotopic constraints from eastern Transhimalayan batholiths on the precollisional magmatic and tectonic evolution in southern Tibet.TECTONOPHYSICS,477(1-2),3-19.
MLA	Chiu, Han-Yi,et al."Zircon U-Pb and Hf isotopic constraints from eastern Transhimalayan batholiths on the precollisional magmatic and tectonic evolution in southern Tibet".TECTONOPHYSICS 477.1-2(2009):3-19.